Theif build, second disc?
It’s t-h-i-e-f.
Try http://dulfy.net/2014/07/10/gw2-thief-pve-class-guide/ for an outstanding thief guide written up by rT. This is aimed more at dungeon runners, but it’s still really viable for all PVE.
Or you can run some terrible thief build using tons of points into SA and Trickery trait-lines and plink-plink at world bosses all day with your shortbow if that’s your thing, the world bosses will still die and you will still get your loot.
https://forum-en.gw2archive.eu/forum/professions/thief
here is the thief forum. btw, learn how to play with zerker gear. it will help you later in the game
second disc?